Question: Letter of findings I recently encountered a lightning protection system on a water treatment plant that was certified by ...
Question: GTO cable Which GTO cable types may be used in electric signs? I am especially interested in the cable ...
Question: For outlet boxes that support ceiling suspended fans, does UL consider out-of-balance fans? Answer: Section 422.18(a) Section 422-18(a) of ...
Question: Exit Signs I’ve noticed that the color, size, and visibility of exit signs varies greatly. Do UL requirements permit ...